<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Edge cases for minsize and maxsize</title>
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
<link rel="help" href="https://mathml-refresh.github.io/mathml-core/#dictionary-based-attributes">
<meta name="assert" content="Verify edge cases for minsize and maxsize .">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  math {
      font: 25px/1 Ahem;
  }
  @font-face {
      font-family: operators;
      src: url("/fonts/math/operators.woff");
  }
  mo {
      font-family: operators;
  }
</style>
<script>
  setup({ explicit_done: true });
  window.addEventListener("load", () => { document.fonts.ready.then(runTests); });

  function runTests() {
      var epsilon = 1;
      var emToPx = 25;
      test(function() {
          assert_approx_equals(document.getElementById("negative_minsize").getBoundingClientRect().height, 5 * emToPx, epsilon);
      }, `minsize < 0 is treated as 0`);

      test(function() {
          assert_approx_equals(document.getElementById("maxsize_less_than_minsize").getBoundingClientRect().height, 7 * emToPx, epsilon);
      }, `maxsize < minsize is treated as maxsize = minsize`);

      test(function() {
          assert_less_than(document.getElementById("minsize_less_than_negative_maxsize").getBoundingClientRect().height, 2 * emToPx);
      }, `minsize < maxsize < 0 is treated as maxsize = minsize = 0`);

      test(function() {
          assert_approx_equals(document.getElementById("zero_target_size_with_minsize").getBoundingClientRect().height, 4 * emToPx, epsilon);
      }, `target size = 0 is treated as Tascent = Tdescent = minsize/2`);

      done();
  }
</script>
</head>
<body>
  <div id="log"></div>
  <p>
    <math>
      <mrow>
        <mspace width="1em" height="5em" style="background: blue"/>
        <mo id="negative_minsize" minsize="-10em" stretchy="true" symmetric="false">⥯</mo>
        <mn><!-- not space like --></mn>
      </mrow>
    </math>
  </p>
  <p>
    <math>
      <mrow>
        <mspace width="1em" height="5em" style="background: blue"/>
        <mo id="maxsize_less_than_minsize" minsize="7em" maxsize="2em" stretchy="true" symmetric="false">⥯</mo>
        <mn><!-- not space like --></mn>
      </mrow>
    </math>
  </p>
  <p>
    <math>
      <mrow>
        <mspace width="1em" height="5em" style="background: blue"/>
        <mo id="minsize_less_than_negative_maxsize" minsize="-2em" maxsize="-1em" stretchy="true" symmetric="false">⥯</mo>
        <mn><!-- not space like --></mn>
      </mrow>
    </math>
  </p>
  <p>
    <math>
      <mrow>
        <mspace width="1em" height="0em" style="background: blue"/>
        <mo id="zero_target_size_with_minsize" minsize="2em" stretchy="true" symmetric="true">⥯</mo>
        <mn><!-- not space like --></mn>
      </mrow>
    </math>
  </p>
</body>
</html>
